Remove second tokio runtime (#2831) #10837

Job	Run time
Test scarb 2.8.3	2m 19s
build-test-forge-e2e-nextest-archive	1m 28s
Test coverage error	1m 5s
scarbfmt	6s
rustfmt	15s
Test Cheatnet	2m 19s
Test Cast	21m 13s
Test contracts artifacts	3m 50s
Test Conversions	36s
Test Data Transformer	55s
Test Forge Runner	51s
Test Forge Scarb Plugin	36s
Test Forge / Unit and Integration Tests	17m 12s
Test Scarb Api	1m 33s
Test Building Docs	11m 29s
clippy	45s
Test Shared	40s
Check typos	7s
Test Forge / E2E Tests (1)	2m 28s
Test Forge / E2E Tests (2)	6m 26s
Test Forge / E2E Tests (3)	2m 8s
Test Forge / E2E Tests (4)	3m 48s
Test Forge / E2E Tests (5)	2m 22s
Test Forge / E2E Tests (6)	2m 37s
Test Forge / E2E Tests (7)	2m 13s
Test Forge / E2E Tests (8)	2m 10s
	1h 31m 31s

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